6138

The Seiko 6138 series occupies a special place in chronograph history, debuting in the early 1970s as one of the world’s first automatic chronographs with both a column wheel and vertical clutch. Models like the 6138-0011 “UFO” and 6138-0030 “Kakume” are especially sought after, each with its distinct dial layout and case shape. Collectors are drawn to the 6138 for its combination of technical innovation and bold, era-defining design.

Within the lineup, reference numbers matter: the 6138-0011 features a rounded, cushion case and contrasting subdials, while the 6138-0030 is known for its square registers and blocky hands. All variants house the in-house Caliber 6138, a reliable automatic movement with both day and date complications and a 30-minute chronograph counter. Water resistance varies by model and should be checked if you plan to wear it regularly.

Price differences are driven by dial condition, originality of hands and pushers, and whether the original bracelet is included. The “Kakume” and “UFO” typically command premiums, especially with unpolished cases and untouched dials. Expect servicing needs, as these movements are now vintage, but parts are still available thanks to Seiko’s popularity. If you’re after a piece of 1970s mechanical ingenuity with real collector cachet, the 6138 series deserves a close look.